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Financial risk management - Credit risk - concentration of risk (Details) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Disclosure of credit risk exposure [line items]
Securities	R$ 33,406,040	R$ 19,515,659
Business loans
Disclosure of credit risk exposure [line items]
Securities	3,017,158
Real Estate loans
Disclosure of credit risk exposure [line items]
Securities	5,121,411	3,471,354
Loans and advances to customers
Disclosure of credit risk exposure [line items]
Securities	R$ 17,216,362	R$ 8,790,058
Concentration by product	100.00%	100.00%
Loans and advances to customers | Largest debtor
Disclosure of credit risk exposure [line items]
Securities	R$ 274,262	R$ 144,821
Concentration by customer	1.59%	1.65%
Loans and advances to customers | Total of the 20 largest debtors
Disclosure of credit risk exposure [line items]
Securities	R$ 2,034,977	R$ 2,145,985
Concentration by customer	11.82%	24.41%
Loans and advances to customers | Total of the 50 largest debtors
Disclosure of credit risk exposure [line items]
Securities	R$ 2,627,038	R$ 1,695,446
Concentration by customer	15.26%	19.29%
Loans and advances to customers | Total of the 100 largest debtors
Disclosure of credit risk exposure [line items]
Securities	R$ 3,138,861	R$ 2,157,462
Concentration by customer	18.23%	24.54%
Loans and advances to customers | Payroll Card
Disclosure of credit risk exposure [line items]
Securities	R$ 65,263	R$ 67,732
Concentration by product	0.38%	0.77%
Loans and advances to customers | Credit Card
Disclosure of credit risk exposure [line items]
Securities	R$ 4,798,318	R$ 1,904,643
Concentration by product	27.85%	21.67%
Loans and advances to customers | Overdraft protection agreement
Disclosure of credit risk exposure [line items]
Securities	R$ 12,862	R$ 20,193
Concentration by product	0.07%	0.23%
Loans and advances to customers | Checking Account
Disclosure of credit risk exposure [line items]
Securities	R$ 33,234	R$ 14,232
Concentration by product	0.19%	0.16%
Loans and advances to customers | Payroll loans and personal credit
Disclosure of credit risk exposure [line items]
Securities	R$ 3,467,924	R$ 1,551,399
Concentration by product	20.14%	17.65%
Loans and advances to customers | Business loans
Disclosure of credit risk exposure [line items]
Securities	R$ 3,017,158	R$ 1,582,868
Concentration by product	17.52%	18.01%
Loans and advances to customers | Real Estate loans
Disclosure of credit risk exposure [line items]
Securities	R$ 5,121,411	R$ 3,471,354
Concentration by product	29.75%	39.49%
Loans and advances to customers | Rural loans
Disclosure of credit risk exposure [line items]
Securities	R$ 700,192	R$ 177,637
Concentration by product	4.07%	2.02%

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- Definition

Concentration of Risk Percentage For Customer Concentration Based On Benchmark Of Amount Receivable

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- Definition

Concentration Of Risk Percentage For Product Concentration Based On Benchmark Of Amount Receivable

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The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

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